28856197 has 2 divisors, whose sum is σ = 28856198. Its totient is φ = 28856196.

The previous prime is 28856161. The next prime is 28856209. The reversal of 28856197 is 79165882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24860196 + 3996001 = 4986^2 + 1999^2 .

It is a cyclic number.

It is not a de Polignac number, because 28856197 - 2²³ = 20467589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28856797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428098 + 14428099.

It is an arithmetic number, because the mean of its divisors is an integer number (14428099).

Almost surely, 2^28856197 is an apocalyptic number.

It is an amenable number.

28856197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28856197 is an equidigital number, since it uses as much as digits as its factorization.

28856197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 46.

The square root of 28856197 is about 5371.7964406705. The cubic root of 28856197 is about 306.7230151392.

The spelling of 28856197 in words is "twenty-eight million, eight hundred fifty-six thousand, one hundred ninety-seven".